Ответ:

\(1\frac{1}{6}=\frac{7}{6}\), \(2\frac{2}{19}=\frac{40}{19}\).

\(\frac{15}{28}\cdot\frac{7}{6}=\frac{5}{8}\).

\(3-\frac{5}{8}=\frac{19}{8}\).

\(\frac{19}{8}\cdot\frac{40}{19}=5\).

Ответ: 5.